<!DOCTYPE html>
<html lang="zh-CN">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <!-- 准备好一个"容器" -->
    <div id="test"></div>

    <!-- 引入react核心库 -->
    <script type="text/javascript" src="../js/react.development.js"></script>
    <!-- 引入react-dom,用于支持react操作DOM -->
    <script type="text/javascript" src="../js/react-dom.development.js"></script>
    <!-- 引入babel,用于将jsx转为js -->
    <script type="text/javascript" src="../js/babel.min.js"></script>

    <script type="text/babel">
        //1.创建组件
        class Demo extends React.Component {
            state = { isHot: false };
            //展示左侧输入框的数据
            showInfo = () => {
                const { input1 } = this;
                alert(input1.value)
            }
            changeWeather = () => {
                //获取原来的状态
                const { isHot } = this.state;
                //更新状态
                this.setState({ isHot: !isHot })
            }

            saveInput = (c) => {
                this.input1 = c;
                console.log('@', c);
            }

            render() {
                const { isHot } = this.state;
                return (
                    <div>
                        <h2>今天天气很{isHot ? '炎热' : '凉爽'}</h2>
                        {/* <input ref={(currentNode) => { this.input1 = currentNode; console.log('@', currentNode); }} type="text" /> <br /><br />*/}
                        <input ref={this.saveInput} type="text" /><br /><br />
                        <button onClick={this.showInfo}>点我提示输入的数据</button>
                        <button onClick={this.changeWeather}>点我切换天气</button>
                    </div>
                )
            }
        }

        //2.渲染虚拟DOM到页面
        ReactDOM.render(<Demo />, document.getElementById('test'))

    </script>



</body>

</html>